What Do You Know About Gasoline Fuel Systems? Trivia Quiz

25 Questions | Total Attempts: 4487

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What Do You Know About Gasoline Fuel Systems? Trivia Quiz

What do you know regarding gasoline fuel systems, and do you think you know enough to pass this quiz? The fuel system is critical in storing and delivering the gasoline or diesel fuel, which helps the engine to run. If there is one component out of place, it could throw off the whole fuel system. Take this quiz to learn more about gasoline fuel systems.


Questions and Answers
  • 1. 
    The most important job of the fuel system is to optimize engine performance while:
    • A. 

      Keeping fuel consumption and emissions to a minimum.

    • B. 

      Keeping car owners happy with acceptable vehicle performance.

    • C. 

      Making sure all DMV rules are adhered to.

    • D. 

      Making sure all DMV rules are adhered to.

  • 2. 
    Early mechanically operated fuel systems typically sprayed:
    • A. 

      Fuel from an injector in the throttle body on the intake manifold.

    • B. 

      A pulsed stream of fuel delivered behind the intake valves.

    • C. 

      A sequential delivery of fuel from individual injectors on the intake manifold.

    • D. 

      A continuous flow of fuel through injectors at each intake port.

  • 3. 
    All of these are advantages of electronically controlled fuel injection over mechanical injection systems EXCEPT:
    • A. 

      Continuous air–fuel adjustments are possible.

    • B. 

      Reduced emissions are achieved.

    • C. 

      Fuel can be delivered in a continuous stream.

    • D. 

      Reduced fuel consumption is achieved.

  • 4. 
    Tech A says that an electronic control unit (ECU)/power train control module (PCM) is needed to make electronic fuel injection (EFI) function correctly. Tech B says that most early EFI systems were throttle body injection (TBI) type systems. Who is correct?
    • A. 

      Tech A

    • B. 

      Tech B

    • C. 

      Both Techs A and B

    • D. 

      Neither Tech A nor B

  • 5. 
    All of these are subsystems of modern fuel injection systems EXCEPT:
    • A. 

      A fuel supply system.

    • B. 

      An emissions system.

    • C. 

      An air supply system.

    • D. 

      A fuel metering system.

  • 6. 
    Which of these fuel characteristics helps to prevent the air–fuel mixture from spontaneously igniting in the combustion chamber?
    • A. 

      The ignition temperature

    • B. 

      The octane rating

    • C. 

      The cetane rating

    • D. 

      The antiknock rating

  • 7. 
    For gasoline to burn properly, it must be mixed with the right amount of:
    • A. 

      Carbon.

    • B. 

      Air.

    • C. 

      Hydrogen.

    • D. 

      Lead.

  • 8. 
    Which of these describes when the air–fuel mixture spontaneously ignites before the spark plug fires?
    • A. 

      Detonation

    • B. 

      Advanced ignition

    • C. 

      Spark advance

    • D. 

      Pre-ignition

  • 9. 
    Tech A says that a slightly lean mixture offers good fuel economy and low exhaust emissions. Tech B says that a mixture that is too rich fouls spark plugs and causes incomplete burning. Who is correct?
    • A. 

      Tech A

    • B. 

      Tech B

    • C. 

      Both Techs A and B

    • D. 

      Neither Tech A nor B

  • 10. 
    For a gasoline engine, the optimum air to fuel ratio by mass is about:
    • A. 

      12.1:1.

    • B. 

      14.7:1.

    • C. 

      16.3:1.

    • D. 

      18.5:1.

  • 11. 
    The term “stoichiometric ratio” describes the chemically correct air–fuel ratio necessary to achieve all of these EXCEPT:
    • A. 

      Complete combustion of the fuel and air.

    • B. 

      Good fuel economy.

    • C. 

      Maximum engine power.

    • D. 

      Reasonably clean emissions.

  • 12. 
    Tech A says that most fuel-injected vehicles use one or two electrical pumps to supply the fuel system with pressurized fuel. Tech B says that with today's systems, a fuel pump is likely to be located inside the fuel tank. Who is correct?
    • A. 

      Tech A

    • B. 

      Tech B

    • C. 

      Both Techs A and B

    • D. 

      Neither Tech A nor B

  • 13. 
    A resistor that changes its resistance with changes of temperature is called a:
    • A. 

      Thermistor.

    • B. 

      Transistor.

    • C. 

      Potentiometer.

    • D. 

      Rheostat.

  • 14. 
    Modern fuel filters typically have all of these characteristics EXCEPT:
    • A. 

      They use pleated paper as a filter element.

    • B. 

      They prevent small amounts of water from getting past.

    • C. 

      They serve as an accumulator to quiet the system.

    • D. 

      They are directional in nature.

  • 15. 
    Which of these is a sensor for measuring crankshaft position?
    • A. 

      Camshaft position sensor (CMP)

    • B. 

      Crankshaft position sensor (CKP)

    • C. 

      Intake air temperature (IAT)

    • D. 

      Manifold absolute pressure sensor (MAP)

  • 16. 
    The purpose of the vehicle speed sensor (VSS) is to measure the:
    • A. 

      Turbulence in the incoming airstream.

    • B. 

      Throttle position.

    • C. 

      Speed of the vehicle.

    • D. 

      Coolant temperature.

  • 17. 
    The barometric pressure (BARO) sensor works in conjunction with the:
    • A. 

      Mass airflow (MAF) sensor.

    • B. 

      Manifold absolute pressure (MAP) sensor.

    • C. 

      Vehicle speed sensor (VSS).

    • D. 

      Intake air temperature (IAT) sensor.

  • 18. 
    Which of these has the function of monitoring the noise that is created by a pressure spike in the combustion chamber?
    • A. 

      Barometric pressure (BARO) sensor

    • B. 

      Manifold absolute pressure (MAP) sensor

    • C. 

      Detonation sensor

    • D. 

      Knock sensor

  • 19. 
    Tech A says that engine misfiring will cause a lean exhaust condition. Tech B says that engine misfiring can cause overheating of the catalytic converter. Who is correct?
    • A. 

      Tech A

    • B. 

      Tech B

    • C. 

      Both Techs A and B

    • D. 

      Neither Tech A nor B

  • 20. 
    The on and off time of a stepper motor relates to its duty cycle, which is generally expressed as a:
    • A. 

      Percentage.

    • B. 

      Numeric value.

    • C. 

      Binary number.

    • D. 

      Hexi-decimal value.

  • 21. 
    A variation in pulse width at a fixed frequency is called:
    • A. 

      Duty cycle.

    • B. 

      Analog cycle.

    • C. 

      Pulse-width modulation.

    • D. 

      Digital cycle.

  • 22. 
    Tech A says that fuel pump pressure can often be tested by accessing a test port. Tech B says that fuel pump volume can be affected by the condition of the fuel injectors. Who is correct?
    • A. 

      Tech A

    • B. 

      Tech B

    • C. 

      Both Techs A and B

    • D. 

      Neither Tech A nor B

  • 23. 
    A fuel pump can be tested using a lab scope and a low-amp clamp to:
    • A. 

      Graph the current flow.

    • B. 

      Measure the fuel pressure.

    • C. 

      Measure the volume.

    • D. 

      Test for pressure loss due to leaks.

  • 24. 
    The engine misfire monitor directly detects a fault by monitoring:
    • A. 

      Exhaust emissions.

    • B. 

      Crankshaft speed.

    • C. 

      Cylinder head temperature.

    • D. 

      Transmission output shaft speed.

  • 25. 
    The power train control module (PCM) must control a high-current fuel pump. The best actuator to use would be a:
    • A. 

      Bipolar transistor.

    • B. 

      MOSFET.

    • C. 

      Relay.

    • D. 

      Set of drivers.

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